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2Â¥2012-12-21 10:37:56
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The polarization curve, cyclic polarization curves and electrochemical impedance spectroscopy ( EIS ) on a 904L stainless steel in hydrofluoric acid and concentrated sulfuric acid are mixed liquid corrosion behavior. The results showed that: hydrofluoric acid mass fraction is less than 2%, the 904L stainless steel in concentrated sulphuric acid corrosion inhibition; hydrofluoric acid mass fraction is higher than 2%, the 904L stainless steel in concentrated sulphuric acid corrosion have stimulative effect. With the increase of mass fraction of hydrofluoric acid, 904L stainless steel corrosion, electrochemical step control to mass transfer and electrochemical step hybrid control. EIS with hydrofluoric acid mass fraction increased from 1 time constant for the 2 time constants, namely performance for capacitive arc at high frequency and low frequency inductive arc.

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